Which component of a stable ecosystem can not be recycled? a) oxygen b) water c) energy d) nitrogen

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Select the graph of the solution. click until the correct graph appears. |x| = 3

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2